hard. >> i had some guilt. maybe i should have taken him out sooner. >> reporter: vinny's not alone. traumatic brain injuries rose from 153,000 in 2001 to nearly 250,000 in 2009. when it happens to young athletes. concussions can be even more dangerous. >> there's many developmental things, neurodevelopmental things that are occurring that make them more sensitive to injury and takes them longer to recover. >> reporter: as co-founder of the california coalition, they're on a mission not to prevent concussions, but he can educate parents, coaches and trainers about the symptoms which include headaches, dizziness, blurred vision, seeing stars and ringing ears. 14-year-old sara perlmutter suffered her first concussion earlier this year during soccer practice. she and her parents took immediate action, giving her brain plenty of time to heal. >> i'm talking about a month and a half, overall including that to come back to soccer.